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Entropy deficiency based image

a technology of entropy deficiency and image, applied in the field of image compression, can solve the problem of inferior quality of compressed image, and achieve the effect of good visual quality and high compression ratio

Inactive Publication Date: 2008-07-03
HUMAN MONITORING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, with missing or reduced elements the quality of a compressed image is inferior, at least to a certain extent, relative to the original image.

Method used

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Embodiment Construction

[0065]The discussion below is divided into sections with headers which are intended for clarity and readability only.

Responsiveness to Quantization—Entropy Deficiency (ED)

[0066]In exemplary embodiments of the invention, the responsiveness to quantization is defined as a change in the entropy of a group of pixels quantized by a preferably (without limiting) a small quantization, relative to the entropy of the original pixels. Optionally, the responsiveness to quantization is obtained by a convenient derivation of the latter definition, namely, as the ratio of the entropy of a quantized group of pixels to the entropy of the original pixels.

[0067]In exemplary embodiments of the invention, the responsiveness is defined according to the following formula.

R=(E(qP)−E(qP)) / E(P)=1−E(qP) / E(P)   (1)

[0068]Wherein

[0069]R is the responsiveness according to the definition,

[0070]E is the entropy −Σpi log2(1 / pi), where pi is the probability of each pixel in the group,

[0071]P is a group of pixels,

[00...

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Abstract

A method for obtaining a quantization factor for image compression by quantization of coefficients of a transformation of an image or part thereof, comprising determining an entropy-related sensitivity to quantization of at least a part of the image; and determining a quantization factor based on the entropy-related sensitivity.

Description

RELATED APPLICATIONS[0001]The present application claims the benefit under 35 USC 119(e) of U.S. Provisional Patent Application No. 60 / 878,062 filed on Jan. 3, 2007 entitled “A SYSTEM AND APPARATUS FOR ENTROPY DEFICIENCY DCT BASED COMPRESSION-DECOMPRESSION OF IMAGES”, and U.S. Provisional Patent Application No. 60 / 878,063 filed on Jan. 3, 2007 entitled “A SYSTEM AND APPARATUS FOR COMPRESSING HIGH RESOLUTION STILL IMAGES OVER LOWER RESOLUTION VIDEO ENCODERS, FOR HANDSETS, CAMERAS, CAMCORDERS, AND CAMERA EQUIPPED PORTABLE MEDIA PLAYERS”; the present application relates also to U.S. patent application Ser. No. 11 / 882,811 filed on Aug. 6, 2007 entitled “COMPRESSING HIGH RESOLUTION IMAGES IN A LOW RESOLUTION VIDEO”. The disclosures of the above-mentioned applications are incorporated herein by reference.FIELD OF THE INVENTION[0002]This invention relates to image compression. Some embodiments relate to methods for image compression responsive to the sensitivity to quantization of an image...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04B1/66
CPCH04N19/176H04N19/70H04N19/119H04N19/61H04N19/60H04N19/423H04N19/14H04N19/17H04N19/187H04N19/194H04N19/44H04N19/126H04N19/103H04N19/43H04N19/51
Inventor DVIR, IRARABINOWITZ, NITZAN
Owner HUMAN MONITORING
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